Thank @MarsellusWallace
I apologize, since i updated from p17 to p24 it works (without changes, never mind ).
Maybe it has reapplied after set it to a specific Host and back…
But while testing today i recognized that the delay also reapply if a service changes state: For example: OK->WARN(5min.) WARN->CRIT(new 5min.) (the first 5min. were not finished before got into CRIT state) → Notification around 9 min. later.
Best regards,
Niclas